Engineered Explosives

Sunburst (This enters the battlefield with a charge
counter on it for each color of mana spent to cast it.)
{2}, Sacrifice Engineered Explosives: Destroy each nonland permanent with converted mana cost
equal to the number of charge counters on Engineered Explosives.
Oh, Lord, bless this thy hand grenade that with it
thou mayest blow thy enemies to tiny bits, in thy
mercy.